Cambridge Dynasound QT1005 Years Warranty The Qt? 100 for sound masking is ideal for single zone spaces of up to 12000 square feet (1115 m2). The Qt 100 is easily controlled from the module’s front panel making volume adjustments quick and easy.Qt? 100 uses sound masking often misunderstood as white noise. Sound masking is at a frequency range more tuned to the frequency of human speech and is more acoustically pleasant than white noise.FeaturesWarranty5 Years